Action whenever the text is changed in the EditText View.
Application to implement a listener
TextWatcher object, for EditText to trigger an action on text change.
Create a new Project in Kotlin
Message can display outside of our application normal UI
1 Open Android Studio.
2 Go to File => New => New Project. Write application name . Then, check Include Kotlin Support and click next button.
3Select minimum SDK you need. However, we have selected 17 as minimum SDK. Then, click next button
4 Then, select Empty Activity => click next => click finish.
5 You will get a newly created project successfully if you have followed steps properly.
Use the below code to Implement a Edittext with Kotlin
MainActivity.kt
import android.support.v7.app.AppCompatActivity import android.os.Bundle import android.text.Editable import android.text.TextWatcher import kotlinx.android.synthetic.main.activity_main.* class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) editTextSample.addTextChangedListener(object : TextWatcher { override fun afterTextChanged(s: Editable) {} override fun beforeTextChanged(s: CharSequence, start: Int, count: Int, after: Int) { } override fun onTextChanged(s: CharSequence, start: Int, before: Int, count: Int) { tvSample.setText("Text is : "+s) } }) } }
main_activity.xml
<?xml version="1.0" encoding="utf-8"?> <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity"> <LinearLayout android:layout_marginTop="20dp" android:orientation="vertical" android:padding="10sp" android:gravity="center_horizontal" android:layout_width="match_parent" android:layout_height="match_parent"> android:layout_height="wrap_content" /> <EditText android:id="@+id/editTextSample" android:textSize="20sp" android:layout_marginTop="50dp" android:hint="Enter Text ..." android:layout_width="match_parent" android:layout_height="wrap_content"/> <TextView android:id="@+id/tvSample" android:layout_marginTop="20dp" android:textColor="@color/colorPrimary" android:textStyle="bold" android:textSize="16dp" android:layout_width="wrap_content" android:layout_height="wrap_content"/> </LinearLayout> </android.support.constraint.ConstraintLayout>
